San Antonio Spur Tim Duncan laughs with friends as he gets ready to do the arm drop for starting racers during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Tim Duncan laughs with friends as he gets ready to do the arm drop for starting racers during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 4 of 25

Guns and hand grenades are displayed in the back of a show vehicle during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Guns and hand grenades are displayed in the back of a show vehicle during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 5 of 25

Image 6 of 25

Jesse Ybanez, center, and his son Julian Ybanez watch racers take off during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015. The two work on cars together at home, their favorite is their '87 Mustang GT. less

Jesse Ybanez, center, and his son Julian Ybanez watch racers take off during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015. The two work on cars together at home, their ... more

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 7 of 25

Tevor Smith and his son Billy Smith make last-minute adjustments to their '65 Galaxy before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Tevor Smith and his son Billy Smith make last-minute adjustments to their '65 Galaxy before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 8 of 25

San Antonio Spur Patty Mills talks to friends before starting a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Patty Mills talks to friends before starting a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 9 of 25

Conan Wiltse with San Antonio Raceway directs racers during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Conan Wiltse with San Antonio Raceway directs racers during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 10 of 25

Image 11 of 25

A spectator walks by a Edward Council's '65 Chevelle Malibu SS before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

A spectator walks by a Edward Council's '65 Chevelle Malibu SS before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 12 of 25

San Antonio Spur Patty Mills starts a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Patty Mills starts a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 13 of 25

Tire marks can be seen on the road during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Tire marks can be seen on the road during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 14 of 25

San Antonio Spur Tim Duncan prepares to start a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Tim Duncan prepares to start a race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 15 of 25

Image 16 of 25

A driver burns rubber before taking off from the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

A driver burns rubber before taking off from the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 17 of 25

San Antonio Spur Tim Duncan covers his ears to avoid the deafening sound as cars pull up to the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Tim Duncan covers his ears to avoid the deafening sound as cars pull up to the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 18 of 25

Roy Treviño sits in his '68 Camarro as he waits his turn to race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Roy Treviño sits in his '68 Camarro as he waits his turn to race during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 19 of 25

San Antonio Spur Tim Duncan signs autographs during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Tim Duncan signs autographs during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 20 of 25

Image 21 of 25

A canister of NOS is installed before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

A canister of NOS is installed before the start of the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 22 of 25

Jesse Ybanez, center, and his son Julian Ybanez watch racers take off during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015. The two work on cars together at home, their favorite is their '87 Mustang GT. less

Jesse Ybanez, center, and his son Julian Ybanez watch racers take off during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015. The two work on cars together at home, their ... more

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 23 of 25

A biker pulls up to the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

A biker pulls up to the starting line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News

Image 24 of 25

San Antonio Spur Tim Duncan directs racers to the front line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

San Antonio Spur Tim Duncan directs racers to the front line during the Black Jack Arm Drop Race at San Antonio Raceway on Saturday, September 5, 2015.

Photo: Matthew Busch, For The San Antonio Express-News / For The San Antonio Express-News